Preheat oven to 350 degrees. Spray an 8-inch square baking pan with non-stick cooking spray. Line it with 2 pieces of parchment paper, leaving an overhang on all sides. This will help you remove them from the pan before cutting into bars.

In a heat proof bowl, add the semi-sweet chocolate and butter. Microwave for 1 minute. Remove and stir. Microwave in 15 second intervals until completely melted. Whisk in the cocoa powder until smooth. Set aside to cool.

In a large bowl, whisk together the eggs, sugar, vanilla extract, and salt until well combined. Slowly pour in the melted chocolate, whisking constantly. Sift in the flour and stir with a wooden spoon just until combined. Pour brownie mixture into prepared pan and tap on the counter to release any bubbles and level. Bake for 32-38 minutes, or until toothpick comes out with a small amount of sticky crumbs. Cool on a wire rack in the pan. Lift brownies out of the pan using the parchment paper, and cut into squares. Dust with powdered sugar. Enjoy!